The league said it suspended Watkins without pay for the first four games of the 2014 regular season. He'll eligible to return to the Chiefs' active roster Sept. 30, the day after Kansas City's Monday night game against the New England Patriots.

No details of the violations were disclosed. The league said Watkins is eligible to participate in all offseason and preseason practices and games.

Watkins is in his third NFL season. He played in one game for St. Louis in 2012 and three for Kansas City last year, including one start.